S-90046A105 4-40 x 1" NAS1801-04-16 High-Strength Steel Hex Head Screws with Phillips Drive

Key Features & Benefits at a Glance

• Superior corrosion resistance with cadmium plating, extending service life in harsh industrial environments
• Exceptional mechanical strength with 160,000 PSI tensile strength and Rockwell C34 hardness for heavy-duty applications
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring reliable fastening performance
• Optimized drive efficiency through external hex/Phillips No. 1 drive for secure installation and removal
• Partial threading design providing enhanced clamping force control in critical assembly operations
• Regulatory compliance assurance meeting NAS1801-04-16, RoHS 3, and REACH standards for global industrial use
• Right-hand thread configuration with standardized UNC pattern for compatibility with existing equipment and tooling

Professional Applications & Engineering Value

These 4-40 UNC steel hex head screws deliver critical engineering solutions where vibration resistance and structural integrity are paramount. The cadmium plated finish provides essential corrosion protection for aerospace, military, and industrial equipment exposed to demanding environmental conditions. With 160,000 PSI tensile strength and Rockwell C34 hardness, these fasteners maintain clamping force under extreme loads, preventing joint failure in critical assemblies. The external hex/Phillips drive accommodates both standard and torque-specific installation tools, while the partial threading design ensures optimal stress distribution across fastened components. Manufactured to NAS1801-04-16 specifications, these screws provide reliable performance in applications requiring precision fastening and regulatory compliance.

Specification Summary & Compliance

These hex head screws feature precision 4-40 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy and engagement. The manufacturing process adheres to NAS1801-04-16 aerospace standards, ensuring consistent quality and performance. Regulatory compliance includes full conformance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) chemical safety requirements, making them suitable for global industrial applications where environmental regulations are critical.